Scythe Kozuti Low Profile CPU Heatsink

Cooling
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Stock Fan Measurements

Specifications: Scythe Kozuti Stock Fan
Manufacturer
Power Rating
2.4 W
Model Number
SY8010SL12M-P
Airflow Rating
34.82 CFM
Bearing Type
Sleeve
Speed Rating
3300 RPM ± 10%
Corners
Open
Noise Rating
32.5 dBA
Frame Size
80 x 80 x 10 mm
Header Type
4-pin
Fan Blade Diameter
74 mm
Starting Voltage
6.0 V
Hub Size
29 mm
Weight
40 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The Kozuti's stock fan is an 11-blade sleeve bearing model with open corners and starting voltage of approximately 6V. It has a high nominal speed which is necessary to compensate for its unusually thin form. The proximity of the intake portion of the fan to the heatsink also forces it to spin a bit faster; our sample ran at 3290 RPM on the heatsink and 100 RPM less in open air.

Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
3290 RPM
34 dBA
9V
2500 RPM
23~24 dBA
8V
2110 RPM
18 dBA
7.5V
1850 RPM
14~15 dBA
7V
1580 RPM
12 dBA
6.5V
440 RPM
<11 dBA
6.0V
240 RPM
<11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

The manufacturer's noise rating is very close to what our instruments measured, a very loud 34 dBA at 12V; At full speed it has a high pitched whine which is absent in Scythe's thicker Slip Stream fans. At 9V much of the turbulence disappears, but it's still fairly buzzy. It starts to become quiet at 8V, dropping below 20 dBA@1m but retains a bit of a hum all the way down to 7.5V. Like many PWM fans, the speed drops off sharply between lower voltages with a 600 RPM difference between 8V and 7V, and more than a 1300 RPM gap between 7V and 6V.


At 8V, the Kozuti stock fan exhibits tonality at approximately 380 Hz and 690 Hz which manifests in the form of a conspicuous hum.

Cooling Results

Scythe Kozuti
Fan Voltage
SPL@1m
Temp
°C Rise
Stock 80mm Fan
12V
34 dBA
46°C
26
9V
23~24 dBA
52°C
32
8V
18 dBA
57°C
37
7.5V
14~15 dBA
60°C
40
7V
12 dBA
65°C
45
Reference 92mm Fan
12V
16 dBA
52°C
32
9V
12 dBA
58°C
38
°C Rise: Temperature rise above ambient (20°C) at load.

The Kozuti had a wide performance spread with almost 20°C separating its highest speed from its inaudible speed. The performance drop was almost linear with fan speed which is unusual as most small heatsinks typically fall apart when set to very quiet levels. At 7V/12 dBA@1m, the stock fan kept the CPU's thermal rise above ambient at 45°C; At 55°C our test processor typically begins to throttle down. Our reference 92 mm Nexus fan, simply draped on top of the heatsink, produced a much better result. At the 12 dBA@1m level, it kept the CPU temperature lower by 7°C.



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